Combined handle and key for a percussive drill



April 9 R. E. DIETERICH ET-AL 24,639

COMBINED HANDLE AND .KEY FOR A PERCUSSIVE DRILL Filed Dec. 8, 1958 I";Zia

United States Patent COMBINED HANDLE AND KEY FOR A PERCUSSIVE DRILLRichard E. Dieterich and Frank A. Werstein, Long Beach, Ind., assignorsto Phillips Drill Company, Michigan City, Ind., a corporation ofIllinois Original No. 2,801,614, dated August 6, 1957, Serial No.535,669, September 21, 1955. Application for reissue December 8, 1958,Serial No. 779,033

9 Claims. (Cl. 121-36) Matter enclosed in heavy brackets appears in theoriginal patent but forms no part of this reissue specification; matterprinted in italics indicates the additions made by reissue.

The invention relates generally to percussive drills for drivingself-drilling shells and the like and more particularly is concernedwith a chuck for such drills having a combined handle and key orejector.

Self-drilling shells of the general type shown in U.S. Patent 1,621,598issued March 22, 1957, to J. H. Phillips have tapered rear ends oppositethe drilling teeth by means of which the shell is wedged into thetapered receiving socket of a chuck which is in turn mounted on apercussion drill or mechanical hammer. The chuck receives repeated blowsfrom the hammer, causing the teeth to bite into the masonry or concrete,and simultaneously the chuck is axially rotated to cause the resultinghole to be as nearly cylindrical as possible, and to enable the. debristo work back through the shell, if same is hollow.

In the case of mechanical hammers, such as for example that shown inU.S. Patent 1,968,055 issued July 31,1934, to J. H. Phillips, the chuckis provided with a pivotally mounted handle swingable on an axis atright angles to the chuck, usually in the form of a heavy wire loop orbail. The workman holds the mechanical harnmer in one hand, urging thesame against the ceiling or wall, and with the other hand he rocks thechuck by swinging the handle back and forth in an are about the axis ofthe chuck. During this process, the handle is arranged approximately atright angles to the chuck axis, and hence is substantially rigidrelative thereto.

After the shell has been sunk to the desired depth, it is withdrawn, thehole is cleaned out, a tapered plug is inserted in the toothed end, andvthe shell once more inserted into the. hole and driven home with severalblows of the hammer. The toothed end expands in the ol under the spr ang in u n of e p an e she l s p m n n ly anch red n h m s n y- I einstances there is an annular fracture groove at the base of the taperto enable the tapered portion of the shell to be broken off by means ofa quick lateral movement of the hammer, leaving the shellflush with thesurface oreven slightly below the surface. In any event, and whether thetapered portion is broken off or not, the chuck must be-cleared for thenext shell. In other words, the tapered end of the shell must be ejectedfrom its wedged engagement in the chuck. This requires considerableforce, since the action of the hammer has been in the meantime enhancingthe wedging engagement.

In U.S. Patent 1,786,029 issued December 23, 1930, to J. Phillips thereis illustrated the type of key or ejectgr heretofore used to clear thechuck, that is, remore the tapered end. of the shell. In addition-to thenas ess a a cr a commodating the bai ha dl t chuck" has been eq i ed. thave an addi ional passa e way at ho co mfini tins i h t sock fc t sh lend. The socket is intersected by the latter passageway so that thetapered end of a shell in the socket protrudes into the passageway. Arod is provided having an angularly bent end insertible into thepassageway, the rod being generally of the same diameter as thepassageway, but having a flat or cam face so that when engaged in thepassageway, rotation of the bend end about the axis of the passagewaywill cause the fiat or cam face to engage the back end of the taper ofthe shell and force the same out of its socket.

As indicated above the principal object of the invention is to provide achuck with a combined handle and key or ejector and thereby alleviatemany diificulties attendant upon the constructions heretofore used.

Other objects of the invention are as follows: the elimination of apassageway through the chuck; the decrease in the length and weight ofthe chuck; the elimination of the need for the workman removing his handfrom the bail, reaching for another tool, inserting the tool into itspassageway and operating the same, removing the tool, and picking up thehandle once more; the elimination of any likelihood of misplacing orlosing or breaking or bending the key or ejector tool; the provision ofan easily formed and quickly installed or replaced combined handle andkey or ejector tool.

Many advantages are collateral to the above, as will become apparent tothose skilled in the art as the invention is described hereinafter, suchas for example the enabling of the workman to drive the shell home afterinserting the tapered plug and merely rotate the handle in an arc of orso about its axis to release the tapered end of the shell from itssocket in the chuck. In order to comply with the patent statutes, aspecific and preferred embodiment of the invention has been detailedhereinafter, both in the specification and in the drawing accompanyingthe same, but only by way of illustration and not limitation, since itwill be obvious that considerable variation in the details, size,proportion, and arrangement of the parts is possible without in any waydeparting from the spirit and scope of the invention, all as defined inthe claims appended.

In the drawing:

Fig. 1 is a side elevational view of a percussive drill, comprising anelectric hammer having the chuck of the invention engaged in the barrelthereof, there being a self-drilling expansible anchor shell wedged inthe chuck.

Fig. 2 is a sectional view taken through the drill and chuck of Fig. 1along the line 2-2 and in the direction indicated, portions being shownin plan, and the View being on an enlarged scale.

Fig. 3 is a fragmentary sectional view through the chuck along the line33 of Fig. l and in the direction indicated.

Fig. 4 is a sectional view through the chuck on the line 4'-4 of Fig. 2and in the direction indicated, the handle being arranged in normalposition for drilling or driving the shell into the masonry.

Fig. 5 is a view similar to that of Fig. 4 but showing the arrangementwhen the handle has been rotated for ejecting the tapered rear end ofthe shell.

' The percussive drill is designated 10 and its construction is of noimportance to the invention herein, except insofar as it is intended tobe grasped by one hand of the workman, at the handle 11 and pushedforward in using the same. The drill 10 mounts a chuck 13 which has aself-drilling expansible anchor shell 15 engaged therein adapted to bedriven into a body of masonry or co crete The chuck 13fcornprisesanintegral head 19'and .re-. duced diameter shank 2.1 which isinsertedin'the barrel 23 of the drill 10 and retained therein by the engages.ment of a key 25 with an annular groove 27 formed in the shank. The key25 is held in place by means of a spring-pressed cylindrical sleeve 29.Any other means for mounting the shank 21 for receiving the blows of thehammer 31 may be used. The specific structure here shown is the subjectmatter of a co-pending application, Serial No. 536,670, filed September21, 1955, which matured into US. Patent No. 2,767,988 dated October 23,1956, and is not intended to be a limitation herein.

The chuck head 19 has a tapered coaxial socket 33 which intersects atransverse passageway 35 arranged normal to the chuck axis. There isillustrated a shell having a cylindrical body 37, usually hollow, atoothed end 39 adapted to be driven into the masonry 17 and ex pandedalong fracture grooves 41, and provided on its opposite end with a taper43 the length and size of which is such as to matingly wedge in thetapered socket 33. In the shell illustrated there is an annular fracturegroove 45 at the base of the taper 43 so that when the shell is drivenhome the tapered end 43 can be broken off by applying a lateral strainto the same, leaving the stub in the chuck head 19.

The tapered end 43 normally protrudes into the passageway 35. A handle47 is secured to the chuck head 19 being formed as an L-shaped memberhaving an elongate portion 49 and an integrally bent right angle shaftportion 51. The right angle shaft portion 51 is engaged in thetransverse passageway 35, being freely rotatable therein to enableswinging of the handle, and held in place by cotter or other pins 55preventing axial movement of the right angle shaft portion 51 in thepassageway. Friction washers 57 may be used to prevent wear. Obviouslyany other movement limiting means, such as deformations, shoulders andthe like could be used in place of the pins and washers.

Presuming that the handle is arranged as shown in Fig. 1, if the workmanis drilling he may grasp the end 59 of the handle 47 and rock it in anare describing a plane perpendicular to the axis of the chuck 13. Theshell will drill its way into the masonry, and there is no difiiculty inwithdrawing the same, applying the end plug and driving same home.

Instead of the right angle bent shaft portion 51 being uniform indiameter throughout the extent of the passageway 35, it is provided witha reduced diameter cam 61 which is eccentrically positioned to give riseto a space 63 between the cam 61 and the opposite part of the passageway35. The length of the cam 61 along the shaft portion 51 is substantiallyless than the di ameter of the head 19 to provide suitable journallingfor the shaft portion -51 upon the rotation of the handle 47 but isgreater than the diameter of the socket 33 to prevent interference withthe shell ends.

When it is desired to dislodge and eject a tapered end 43, the handle 47is rotated so that the elongate portion 49 describes a plane parallel tothe axis of the chuck 13. The movement of the handle 47 is indicated inbroken lines in Fig. 1. In Fig. 5,'the position of the cam 61 in solidlines is that assumed when the handle 47 has been rotated for ejectionthrough 90 which in most cases will be sulficient to dislodge thetapered end 43. The broken line position of the cam 61 is that assumedwhen the handle has been rotated through 180" and it will be obviousthat this movement will surely dislodge any stub which protrudes intothe passageway 35 even the slightest amount.

The workman will obviouslynot be required to remove his hand from thehandle 47 in ejecting a tapered end 43. Note also the provision of atransverse opening 63 communicating with both the socket 33 and thepassageway 35 to enable the debris to fall out of the chuck whiledrilling is taking place. The debris follows the path of the arrowedline 65 in Fig. 4, the space 63 providing convenient clearance withoutthe need for additional openings in the chuck.

Reference is made herein to the chuck axis. This is to be understood asthe axis of the socket 33, shank 21, barrel 23, etc.

From the above it will be seen that there has been provided a novelchuck for use with shells having ends engaged in the chuck socket, whichis characterized by the provision of a combined handle and key orejector. No further explanation is believed necessary since theadvantages and features of the invention follow from the abovespecification.

What it is desired to claim is:

1. A chuck for a percussive drill and adapted to mount a self-drillingshell having a tapered end, and also adapted to be rotated while thedrill is being used, and comprising a head having a coaxial taperedsocket adapted to receive said tapered end wedgingly engaged therein, atransverse passageway having its axis normal to the chuck axis,intersecting the socket so that the tapered end of the shell wheninstalled protrudes into the transverse passageway, and a combinedhandle and ejector member for rotating the chuck and ejecting thetapered end rotatively engaged in the transverse passageway.

2. A chuck for a percussive drill and adapted to mount a self-drillingshell having a tapered end, and also adapted to be rotated while thedrill is being used, and comprising a head having a coaxial taperedsocket adapted to receive said tapered end wedgingly engaged therein, atransverse passageway having its axis normal to the chuck axis,intersecting the socket so that the tapered end of the shell wheninstalled protrudes into the transverse passageway, and a combinedhandle and ejector member for rotating the chuck and ejecting thetapered end rotatively engaged in the transverse passageway, saidcombined handle and ejector comprising a shaft portion engaged in saidpassageway, and an angularly connected elongate portion extending fromsaid head, eccentric cam means on said shaft portion aligned with saidsocket and positioned to give clearance for said tapered end when saidelongate portion extends generally at right angle to the chuck axiswhereby movement of said elongate portion in a plane normal to saidchuck axis will rotate the chuck without disturbing the tapered end ofthe shell, but swinging of the handle to rotate the shaft portion willbring the cam means into engagement with the said tapered end to ejectsame.

3. A chuck for a percussive drill and adapted to mount a self-drillingshell having a tapered end, and also adapted to be rotated while thedrill is being used, and comprising a head having a coaxial taperedsocket adapted to receive said tapered end Wedgingly engaged therein, atransverse passageway having its axis normal to the chuck axis,intersecting the socket so that the tapered end of the shell wheninstalled protrudes into the transverse passageway, and a combinedhandle and ejector member for rotating the chuck and ejecting thetapered end rotatively engaged in the transverse passageway, saidcombined handle and ejector comprising an L-shaped member the short partbeing rotative in the transverse passageway and having oflset ejectingmeans, and the long part extending from the chuck to serve as a handlefor rotating the chuck during drilling, the ejecting means beinginoperative when the long part is at right angle to the chuck axis butbeing rendered operative when the long part is rotated in a planeparallel to the chuck axis.

4. A chuck as described in claim 3 in which means are provided to limitmovement of said short portion axially of the transverse passageway.

5. A chuck as described in claim 3 in which the ejector means comprisesa decreased diameter eccentric in the short portion aligned with thesocket, having a length along the transverse passageway greater than thediameter of the intersecting part of the socket but less than thedimaintaining the aligned relationship of socket and ec centn'c.

6. A chuck as described in claim 3 in which there is a space betweensaid ejecting means and socket when the handle is being used fordrilling, and there is a second passageway between intersection of thesocket and transverse passageway and the exterior of said chuck toenable discharge of debris through said shell into said space and out ofthe chuck head.

7. A chuck for a percussive drill and adapted to mount a self-drillingshell having a tapered end, and also adapted to be rotated while thedrill is being used, and comprising a head having a coaxial taperedsocket adapted to receive said tapered end wedgingly engaged therein, atransverse passageway having its axis normal to the chuck axis,intersecting the socket so that the tapered end of the shell wheninstalled protrudes into the transverse passageway, and a combinedhandle and ejector member for rotating the chuck and ejecting thetapered end movably engaged in the transverse passageway.

8. A chuck as described in claim 7 in which there is a space between themember and socket when the handle is being used for drilling, and thereis a second passageway between the intersection of the socket andtransverse passageway and the exterior of the chuck enabling dischargeof debris through said shell into said space and out of the chuck head.

9. A chuck for a percussive drill and adapted to mount a drilling toolhaving a tapered end, and also adapted to be rotated while the drill isbeing operated, and comprising, a head having a coaxial socket taperedfor telescopic wedging engagement with said tool end, a transversepassageway having its axis normal to the chuck axis and intersecting thesocket so that the tapered end protrudes into the passageway, and acombined handle and ejector member installed in the passageway forrotating the chuck and having means aligned with the protruding tool endmovable to exert a force against said end for disloa'ging the tool endfrom the passageway without displacing the member from the passageway.

References Cited in the file of this patent or the original patentUNITED STATES PATENTS 1,050,385 Palmgren Jan. 14, 1913 1,786,029Phillips Dec. 23, 1930 1,968,055 Phillips July 31, 1934

